51. D 52. B 53. C 54. D 55. A
56. B 57. B 58. C 59. B 60. A
61. C 62. A 63. C 64. D 65. D
66. A 67. A 68. D 69. D 70. D
Part IV Error Correction
71. as -> to
72. 省略 about
73. these -> those
74. admired -> admiring
75. employer -> employee
76. consciously -> unconsciously
77. comfortably -> comfortable
78. them -> him
79. friend -> friends
80. without aware -> without being aware
Part V Writing
略
